Combine soft butter and sugar. Grind everything with a fork until smooth.
Add kefir, salt and soda.
Stir and add flour in portions.
Knead a soft and elastic dough that does not stick to your hands.
Roll out the dough into a rectangle 2-3 mm thick. on an oiled surface. Brush the dough with vegetable oil, sprinkle with sugar to taste and lemon zest.
Roll the layer into a roll and pinch at the seam.
Cut the roll into pieces, 2-3 cm wide and transfer the blanks to a baking sheet covered with parchment. On top of each roll, press a little with your hands. Bake in the oven at 180 degrees until lightly browned.